CHECKBOOK’S 2019 ONLINE GUIDE to Health Plans for Federal Employees and Retirees CHECKBOOK’s online Guide to Health Plans is available to all Postal Service® employees and retirees at no cost. The online guide provides: Real Cost Comparisons – See plans ranked by estimates of actual out-of-pocket costs. Layering of Information – Find answers by looking at a comparison of basic levels of plans or get more, detailed plan information using CHECKBOOK. Dental and Vision Plans – Evaluate FEDVIP plans available to you. Medicare Integration – See how participating in Medicare as a retiree might affect your health plan decisions.